Mixed fertilizer



Patented Jan. 15, 1929.

UNITED STATES PATENT OFFICE.

ERNST SGHWA'RZ, OF LUDWIGSHAFEN-ON-IHE-RHINE, GERMANY, ASSIGNOR TO I. G.FABBENINDUSTRIE AKTIENGESELLSCHAFT, 0F FRANKFORT-ON-THE-MAIN, GER- MANY,A CORPORATION OF GERMANY.

mrxnn FERTILIZER.

No Drawing. Application filed January 15, 1926, Serialflo. 81,545 andjinGermany January 19, 1925.

A mixed fertilizer of great utility consisting of a mixture of urea,1.111111011111111 phosphate and potassium nitrate or sulfate or bothnitrate and sulfate of potassium, is described in my copendingapplication for patent Serial No. 20,546, filed April 3, 1925.

I have now found thatit is often advantagoons to replace the ammoniumphosphate in the said fertilizer wholly or partly by di-calciumphosphate. Thereby the storage of the fertilizer is considerablyimproved. Though the mixed fertilizer is not completely soluble inWater, the insoluble compound, di-calcium phosphate, contains thephosphoric acid in'a highly efficient citrate-soluble form. Its calciumcontent is also a plant nutrient and in addition the new mixture has theadvantage that the diflicultly soluble di-ealcinm phos-' phate forms avaluable buffer-compound reg.- ulating the reaction of the soil withoutintroducing' any. useless ballast substances into the fertilizer. Thepotassium may be present in the form of any suitable fertilizing salt,for example as a high per cent potassium chlorid.

However, I prefer to employ potassium nitrate or sulfate or a mixturethereof.

The new fertilizer is especially ad vantageous for light soils. Theproportions of the several compounds may be so chosen as to have thechief nutrients K 0, N and P 0 present in the mixture in a reasonableproportion, preferably of 1 part of nitrogen to 1 to 41 parts of R 0 to1 to 3 parts of K 0, but other proportions may also be employed.

The following, examples will further illustrate my invention which,however, is not limited to these examples. The parts are by weight.Ewample 1.

The mixture consists of 30 parts of potassium sulfate, 37 parts of di-calcium phosphate and 33 parts of urea. The fertilizer contains about15.2 per cent of each, nitrogen, P 0

and K 0.

. Example 2.

Mix 40 parts of potassium nitrate, 17 parts of ammonium phosphate, 23parts of di-caL cium phosphate and 20 parts of urea. The mixturecontainsabout 18.4 per cent of each, nitrogen P 0, and K 0.

The pro ortions of these nutrients must notbeequ tains 8 per cent ofnitrogen, 27 per cent of Example 3.

Example 4.

I 15 parts of potassium sulfate, 68 parts of di-calcium phosphate and 17parts of urea are mixed with each other. The fertilizer con- P 0, and 8per cent of K 0.

I claim: 1. A; mixed fertilizer comprising urea, (licalcium phosphateand a fertilizing potassium salt.

2. A mixed fertilizer comprising urea, dicalcium phosphate and apotassium salt se-, lected from the group consisting of potassiumnitrate and sulfate.

3. A mixed fertilizer comprising urea, dicalcium phosphate and potassiumnitrate.

4. A mixed fertilizer comprising urea, dicalcium phosphate, ammoniumphosphate and a fertilizing potassium salt.

5. A mixed fertilizer comprising urea. dicalcium phosphate and ammoniumphosphate I and a'potassium salt selected from the group consisting ofpotassium nitrate and sulfate.

6. A mixed fertilizer comprising urea, dicalcium phosphate and'afertilizing potassium salt and containing N, P 0 and K 0 in abouttheproportion of 1 :1 to 4 :1 to 3.

7. A mixed fertilizer comprising urea, dicalcium phosphate and apotassium salt selected' from the group consisting of potassium nitrateand sulfate, andcontaining N, P 0, and K 0 in about the proportion of1:1 to 4:1 to 3. a 1

8. A mixed fertilizer comprising urea, di-

calcium phosphate and potassium nitrate and 95 containing N, P O and K 0in about the proportion of 1:1 to 4:1 to 3. I

9. A mixed fertilizer comprising urea, dicalcium phosphate and ammoniumphosphate and a. potassium salt selected from the group 100 consistingof potassium nitrate and sulfate and containing N, P 0 and K 0 in aboutthe proportion of 1 :1 to 4:1 to 3.

In testimony whereof I have my hand.

hereunto set ERNST soHwAnz.

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